Utilization of municipal solid waste incinerator fly ash under high

MSW incineration creates a variety of residual products, notably bottom ash and fly ash, which make up approximately 90 % and 5 % of all combustion leftovers, respectively [5].Currently, bottom ash is being repurposed in the reclamation of metals and the production of construction materials [6].Nevertheless, fly ash, which contains organic components high in …

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Study on the Inhibition Effect of Fly Ash on Alkali–Silica

Cracks and other defects in concrete will affect its durability, thermal insulation effect, and energy consumption. ASR is one of the common causes of concrete cracks. In this study, mortar specimens modified with fly ash were prepared using the mortar bar rapid method, and the inhibition effect of ASR in two alkali environments and the building energy efficiency …

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Use and effect of fly ash in concrete: A literature …

A type of fly ash increasingly used for engineering purposes is Vietnamese fly ash, which is used in optimal dosages of 10% and 20%, where an improvement in its mechanical property of flexu ral

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Effect and mechanism of the salt-alkali composite for the …

The coal represents the primary source of fossil energy consumption in China, with an annual consumption reaching 1.91 billion tons in 2019. This places China at the global forefront in terms of annual consumption, a position it has held constantly since 2010 [1].The thermal power generation accounts for a considerable proportion of the coal consumption in China.

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Strength Properties of Alkali-Activated Fly Ash

The self-hardening property of fly ash owing to its free lime content has made fly ash a suitable for construction material . However, the cementitious property of fly ash can be further enhanced by activation . The investigation of strength properties of fly ash has spurred the scientific curiosity in the past few decades.

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MECHANICAL PROPERTIES OF HIGH-VOLUME FLY ASH CONCRETE WITH VARYING FLY

shows the variations in compressive strength of concrete with various percentages of FA at 3, 7, and 28 days. For FA0, the compressive strength increased from 18.6 MPa to 24.0 MPa, and 42.6 MPa ...

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A Ten-Year Study on Alkali Content of Coal Fly Ash

After years of decline, coal consumption has risen significantly in the last year (2021), driven mainly by the ever-increasing demand in fast-growing Asian countries and fostered by rising gas prices in Europe and the United States. Coal is both the largest electricity production source and the largest source of carbon dioxide emission. Coal-fired plants produce electricity …

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Alkali Content of Fly Ash – Measuring and Testing Strategies for …

The lab study focused on the available alkali test and how fly ash alkali content impacts common performance tests (mortar-bar expansion tests). Twenty-one fly ash samples were evaluated …

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Influence of sodium silicate to precursor ratio on …

Metakaolin and fly ash were used as precursor, sodium silicate (solution) and sodium hydroxide were used as alkali-activator, and manufactured sand made from broken limestone was used to ...

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Expansive Soil Stabilization Using Alkali-Activated Fly Ash

According to Fly ash Used for Cement and Concrete (GB/T1596-2017), the stabilizing agent selected low-calcium fly ash, which was purchased in Xinxiang City. The technical index, loss on ignition ...

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(PDF) Physical-chemical index of fly ash quality in view of its

Chemical index of the fly ash quality can be used to show the effectiveness of fly ash on alkali-silica reaction (ASR) of concrete. The effect of 10 type of fly ashes on ASR were...

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Final Report April 2015

Technical Report Documentation Page 1. Report No. 2. Government Accession No. 3. Recipient's Catalog No. IHRB Project TR-628 4. Title and Subtitle 5. Report Date Alkali Content of Fly Ash – Measuring and Testing Strategies for Compliance April 2015 6. Performing Organization Code 7. Author(s) 8. Performing Organization Report No.

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A Modified Chemical Index to Predict Fly Ash Dosage for …

Abstract. It is well chronicled that coal fly ash can mitigate the risk of alkali-silica reaction (ASR) in concrete structures. However, the efficacy of individual fly ashes is highly dependent on their chemical composition. Prescriptive requirements for ASR mitigation have largely focused on whether the fly ash is classified as Class F or Class C per ASTM C618, …

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Immobilization properties and reaction mechanism of municipal …

Municipal solid waste incineration fly ash ... The effects of the technical parameters (alkali activator, sodium silicate modulus, alkali equivalent, water-solid ... (HW18, code 772-002-18) [5]. Among them, the content of calcium salt and chlorine salt accounts for about 60–70 %, the proportion of soluble chlorine salt can be as high as ...

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Workability, rheology, and geopolymerization of fly ash …

The Class F fly ash used in this experiment was obtained from the Huaneng Power Plant in Qingdao, Shandong Province, China. It has a specific surface area of 517 m 2 /kg and an apparent density of 2.12 g/cm 3. Its chemical composition is listed in Table 2. The total Si oxide and Al oxide content of the fly ash is 82.45 %.

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Interfacial Behavior of Slag, Fly Ash, and Red Mud-Based

As shown in Figure 5b, the pattern of change of double-sided shear strength of GPM repaired concrete substrate was negatively correlated with the growth of fly ash content, in other words, the double-sided shear strength continued to decline continuously with the growth of fly ash content. With reference to OPC100, S45F10R45, S42.5F15R42.5 ...

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A Ten-Year Study on Alkali Content of Coal Fly Ash

The scope of this paper is to assess the alkaline content of coal fly ash over a period of 10 years. The Na2O-equivalent of coal fly ash ranged from 0.35% to 2.53%, with an average value of 0.79%.

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Deterioration mechanism of alkali-activated slag and fly ash …

When the fly ash content or alkali dosage was too high, fly ash cannot be activated properly and excessive moisture was consumed, reducing the overall density. ... Air content of concrete was an important index affecting its freeze-thaw resistance. ... (Grant 52178259) and the Technical Service Projects by Qingjian Co., Ltd. (Grant No. 20220149 ...

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Micro/meso scales characterization of alkali-activated fly ash-slag

In addition, there are few related academic achievements. Slag and fly ash are common precursor materials, and there is the most research on alkali-activated fly ash, slag, and fly ash-slag systems [[18], [19], [20]]. C-(A)-S-H gel and N-A-S-H gel are the main hydration products of the alkali-activated fly ash-slag (AAFS) system, and the water ...

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Mechanical and durability properties of alkali-activated fly ash

Findings demonstrate that alkali-activated binders with increased fly ash content have marginally better resistance to acetic acid but mixes with increased slag content have better resistance to ...

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TECHNICAL PAPER EfficiEnt Production of AlkAli-ActivAtEd …

ratios based on the reactive oxide content in the fly ash. 1. IntroductIon Fly ash is most attractive source material to produce a cement-free binder. Alkali-activation of low-calcium fly ash produces

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Coupling Effect of Fly Ash and Lime Sludge Geopolymer in …

AbstractThis study investigates the combined impact of fly ash (FA) and lime sludge (LS) based geopolymer treatment of Edgar plastic kaolin (EPK) clay. ... A. Viana Da Fonseca, and C. Ferreira. 2016. "Structural performance of alkali-activated soil ash versus soil cement." J. Mater. Civ. Eng. 28 (2 ... Note: This content will be debited as ...

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PHYSICAL PROPERTIES AND PORE SOLUTION …

the following fly ash and slag content (100:0, 70:30, 50:50, 30:70, 0:100 wt.%) have been prepared using sodium hydroxide/sodium silicate solutions. The increase of slag amount

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Alkali Content of Fly Ash Measuring and Testing Strategies …

Relationship between total alkali and available alkali for fly ash High-alkali fly ash from Ottumwa Generating Station was not conclusively linked to ASR problems at any field site. It was used in pavements that had both good and poor performance. Sites 2, 5 and 9 all contained OGS fly ash but did not exhibit significant

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Chloride diffusion in alkali-activated fly ash/slag concretes: Role of

Alkali-activated materials (AAMs), manufactured by the reaction between alkaline activator and solid aluminosilicate powders, i.e. fly ash (FA), ground granulated blast furnace slag (GGBFS) and calcined clay, have attracted much interest in academic and industrial fields over the past decades [1], [2].AAMs present comparable mechanical properties and considerably …

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Production of sustainable green mortar by ultrahigh utilization of fly

Production of sustainable green mortar by ultrahigh utilization of fly ash: Technical, economic and environmental assessment. ... Conversely higher alkali content retards the geopolymerization reaction [38], [39]. ... Fly ash (FA) is widely used to synthesize geopolymers, but it is heterogeneous as it consists of reactive, partially reactive ...

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Texas Department of Transportation Fly Ash Database and the …

To verify the usefulness of the ASR durability index, tests were carried out in this study using an ASR reactive sand, two portland cements, four Class C fly ashes, and one Class F fly ash. The results were quite promising, and the use of the fly ash ASR durability index is proposed to screen fly ash for laboratory testing and construction.

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(PDF) GEOPOLYMER MORTAR WITH ALKALIACTIVATED FLY ASH …

Various factors influencing the strength development of alkali-activated fly ash-based geopolymer mortar are discussed, such as activator composition, curing conditions, curing duration, and fly ...

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Production of sustainable green mortar by ultrahigh utilization of fly

Production of sustainable green mortar by ultrahigh utilization of fly ash: Technical, economic and environmental assessment. ... thermogravimetric analysis and strength activity index. Then mortar was prepared by replacing cement with FA up to and the targeted compressive strengths were obtained through cementing and by alkali activation ...

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Influence of the Fly Ash Content on the Fresh and Hardened

A study on the influence of the inclusion of slag or fly ash and five types of superplasticizers on the fresh and hardened properties of alkali-activated cements is presented. Three alkali-activated slag formulations with different fly ash content (0, 15, and 30%) in the presence of five admixtures (vinyl copolymer, melamine, and three polycarboxylates with …

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